70 Rear GSX Spoiler vs 71/2 Weight

I know that the 70 weighed more and required the special trunk rods. Does anyone know what the weights were on these spoilers?

 

Duane would probably know off the top of his head. I thought the 70 had different hole(s) drilled in the underside and thought the weight lighter for the 70.

Here's more info than you probably care for: BuickPerformance GSX Spoilers

 

The 1970 spoiler is a bit over 9 pounds. The 1971 spoiler is 15 pounds. And the 1972 spoiler is just under 17 pounds.

 

Yea the 71/72 are more heavy

 

Thanks Guys.